Method of sealing the seaming portions of a can

ABSTRACT

A CAN BODY IS SEALED TO THE TOP OR BOTTOM PLATE BY APPLYING A RUBBER COMPOUND TO THE PERIPHERY OF THE PLATE, THEN APPLYING A FILM OF URETHANE RESIN TO THE RUBBER TO IMPROVE THE RESISTANCE TO SOLVENTS WHICH MAY BE IN THE CAN CONTENTS, AND THEN ROLLING UP THE LAMINATED PORTION OF THE PLATE OVERLAPPINGLY WITH THE END OF THE CAN IN SUCH A WAY THAT A TRIPLE ROLLED UP LAYER OF THE LAMINATED PORTION MATES WITH A U-SHAPED INVERTED FOLD OF THE CAN BODY.

Oct 24, 1972 YOSHIKATSU sATo 3,700,524

METHOD 0F SALING THE SEAMING PORTIONS OF A CAN Filed May 2e, 1969 FIG Fl G.

i INVENT OR.

United States Patent O 3,700,524 METHOD F SEALING THE SEAMIN G PORTIONS0F A CAN Yoshikatsu Sato, Yokohama-shi, Japan, assignor to Toyo SekanKabushiki Kaisha, Tokyo-to, Japan Filed May 26, 1969, Ser. No. 827,716Claims priority, applicagogsgapan, June 4, 1968,

Int. Cl. B29d 23/00 U.S. Cl. 156-218 2 Claims ABSTRACT 0F THE DISCLOSUREBACKGROUND OF THE INVENTION As the sealing method for a can, heretofore,the can barrel and the top plate, and/or the can body and the bottomplate are seamed by means of a seaming device,4 and a rubber compound,the main components of which being styrene, butadiene, isoprene,neoprene, etc., are applied on the inside periphery of the top plate andthe bottom plate, and the periphery parts of both plates lined withrubber compound are to be wound together with both upper or lower end ofthe can body. In such a case and when the contents of the can are suchsubstances which are mainly of organic solvents such as gasolineadditives, engine cleaner, anticorrosve agent, etc., the rubbercompounds are deteriorated by the contents of the can, and dissolvingout to result in lack of sealing elfect, which causes leaking of thecontent of the can or deterioration of compound by the content of thecan, and the deteriorated particles may oat in the contents in the can,thus adversely affect the content of the can. Accordingly, it has beennecessary to effect soldering as a sealing means at the seaming portionsof the can body with the top plate and/or of the can body with thebottom plate when the contents of the can are, for example, gasolineadditive, engine cleaner, anticorrosve agent, etc., the main componentthereof being organic solvents as stated above.

The present invention provides a means for seaming of a can which arefree from said soldering, which is troublesome and uneconomical, evenwhen the contents of the can are, for example, gasoline additive, enginecleaner, anticorrosve agent, etc., the main component thereof beingorganic solvents.

SUMMARY OF THE INVENTION The present invention relates to an improvementin a method applicable on seaming portions of a can body with the topplate and/ or a can body with the base plate using rubber compounds, themain component thereof being styrene, butadiene, isoprene, neoprene,etc.

An object of the present invention is to provide a method of sealing atseaming portions of a can which maintains the same lining property aspossessed heretofore by conventional rubber compounds, and the sealingeffect is not interfered by the content of the can, even if the contentsin the can may be, for example, gasoline additives, engine cleaners,anticorrosve agents, the main component of which being organic solvents.

lCe

A further object of the present invention is to provide a method ofsealing at the seaming portions of a can which comprises the steps oflining or applying a conventional rubber compound on the can material,and after the surface has been dried, coating on the surface of therubber compound with an non-dissolving paint such as urethane resin toform a rm, and rolling up the laminated portion formed by the rubbercompound and urethane resin into the end portion of the can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of theessential part for explaining the method of the present invention,

FIG. 2 is a sectional view showing a case where the method according tothe present invention is applied on thed seaming portion of the can bodyand the top plate, an

FIG. 3 is a sectional View showing a case where the method according tothe present invention is applied on the seaming portion of the can bodywith the bottom plate.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will now bedescribed of embodimental examples referring to the drawings.

In FIG. l, a rubber compound is applied on the seaming portion 2 of thecan material 1 so as to form a rubber compound layer 3, and on thisrubber compound layer 3 is coated with a urethane resin paint so as toform a film 4. In this manner a laminated portion 5, formed by therubber compound layer 3 and the lm 4, is provided on the seaming portion2 of the can material 1. When the seaming is to be eiected between theperiphery at the upper end of a can body and the periphery of a topplate, said lamination 5 is formed on the periphery at the upper orlower surface of the top plate 6 as shown in FIG. 2, and rolling up theperiphery of the top plate 6 and the peripheral upper end of the canbody 7 so that the laminated portion 5 is interposed at the junction ofrolled portion 8 of the periphery of the top plate 6 and the rolledportion 9 of the can body 7 by seaming.

When it is required to seam the periphery of the bottom plate 10 withthe peripheral lower end of the can body 7 similar to the case of FIG,2, the lamination 5 is formed on the upper surface or lower surface ofthe bottom plate 10, rolling up the peripheral lo'wer end of the canbody 7 so that the laminated portion 5 is interposed at the junctionbetween rolled portion 11 of the periphery of the bottom plate 10 andthe rolled portion 12 of the can body 7 by seaming.

The quantitative proportion of the rubber compound and the urethaneresin lilm for forming the laminated portion of the rubber compound andthe urethane resin lm is preferably selected at 4:1 through 4:3.

The object of the present invention is to provide a. can and a sealingmethod at the seaming portion of a can which has seaming portionsprovided both with elasticity owing to the rubber compound and ananti-solvent property due to urethane resin paints. As compared with theconventional means of using solder, rubber compounds and urethane resinsare both inexpensive, so that it is excellent in view of economicalstandpoint.

What is claimed is:

1. A method of sealing a can body at seaming portions, comprising thesteps of forming, at the seaming portions of the can material,

on one side of a top or bottom plate of a can, adjacent the peripherythereof, a laminated portion comprising in combination the steps ofapplying a rubber compound layer on said top or bottom plate ReferencesCited and coating a film of urethane resins on said pe- UNITED STATESPATENTS riphery of said top or bottom plate and completely spectively,of the can body for the sealing thereof, 2,623,444 12/1952 Maler e1a1156-218 and thereby forming with said periphery and said 2,650,1858/1953 Larson et al- 156-310 parallel layers complementarily mating witha U- 3,400,741 9/1968 Rb1ns0n et 31- 156-218 shaped inverted fold of thecorresponding end of 3,369,568 2/1968 Dal/1561 a1- 22o-81 nated ortion.2. The nlxaethod as set forth in claim 1, wherein the 15 REUBEN EPSTEIN,Pflmal'y Examiner quantative proportion of said rubber compound layerand U s C1 X R said urethane resin lm for forming said laminated portionis set within a range from 4:1 to 4:3. 156-310, 314, 315; 220-67

